# Parallel Axis Theorem

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Can someone give me a good explanation of the Parallel Axis Theorem and when to use it? I'm slightly confused about when to apply this equation. Thanks!
asked Oct 28, 2013

## 1 Answer

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For any object rotating around its center of mass, you will need to use $I_{com}$. If the rotational axis is away from the center of mass, you will need to use the parallel Axis theorem to find the momentum of inertia in that situation. In applying the theorem, the M would be the total mass of the object and h would be the distance between the center of mass and the new rotational axis. $$I=I_{com}+Mh^2$$
answered Oct 28, 2013 by (21,750 points)